Process for dyeing acetyl cellulose



Patented June 17, 1924.

re 'rr JAMES BADDILEY AND JAMES HILL, OF MANCHESTER, AND EDWARD BERTRAM I ANDERSON, OF HIEMYOCK, NEAR TIVERTON, ENGLAND, ASSIGNORS TO BRITISH DYESTUFFS CORPORATION LIMITED, OF MANCHESTER, ENGLAND.

PROCESS FOR DYEING ACE'IYL CELLULOSE;

No Drawing.

To all whom it may concern:

Be it known that we, JAMEs BADDILEY and Jaime HILL, residents of Manchester, England, and EDWARD B'ERTRAM ANDERSON, resident of Hemyock, nr. Tiverton, England, subjects of the King of England, have invented certain new and useful Improvement in the Processes for Dyeing Acetyl Cellulose, of which the following is a specification.

Speaking generally it has net hitherto been possible to dye acetyl silk or fibres consisting of or containing the same with acid or direct dyes. In our view the process of acetyl silk dyeing is a kin to extraction of organic matter from aqueous solution by a non-miscible organic solvent. direct dyeing colouring matters used for dyeing wool and cotton are solubilized in most cases by sulpho groups but whilst sulpho groups do confer water solubility they render the dyestuffs insoluble in organic solvents and such dyestufis have little or no aifinity for artificial fibres or masses formed of unhydrolyzed acetyl cellulose.

' We have recognized the rule that dyestufis, which are solubilized by containing The acid and hpplicatlon filed July 23, 1923. Serial No. 653,353.

carboxylic acid groups in' the molecule, remain soluble in organic solvents and are suitable for dyeing acetyl silk.

The new rule can be" applied in the manufacture of dyestuffs for acetyl silk in various ways. In the present application for patent we claim as our invention the use,

in dyeing acetyl silk, of soluble amino azo.

dyestuffs containing one or more carboxylic acid groups and containing further a diazotizable amino group so that after dyeing with the carboxylated azo amino dye difierent shades can be obtained by diazotizing the dyestufi' on the fibre and developing With various well-known developers in the usual way.

The soluble amino azo dyestufis can be obtained by the standard reactions for obtaining amino azo dyestufli's but using carboxylate'd materials for either the diazo compound or for the component or components or both and no sulphonated materials can be employed.

The following table gives instances of the new dyestuffs and the shades obtained upon direct dyeing and the shades after development with some of the ordinary developers.

Shade on acetyl silk.

Dev.with th Direct. B-oxynaphthoic o B naphmol' acid. dip enylamlne.

l m-Aminobenzolcacid-l-o-anlsidlne. Yellow Scarlet Magenta Gold. 3 m-Amlnobenzoicacld+anthranllicacid Yellow Re Blulsli-red Ol ve. 3 p-Amlno'sallcyllcacid-la-naphthylamine Yellow Vwlet, Reddish-blue Olive 4 5-AoetYl-amlno-2-amino-4-methoxy-toluene+fl-oxynaph- Blue-vlolet Greemsh blue... Blue Reddishvmlet.

thoic acid (hydrolized). I 5 m-Aminobenzoicacid+p-xylidine+m-phenylene-diamme. Redm, Reddgsh-brown. Redd sh-brown- Brown. 6 m-Amlnobenzoicacld+p-xylidine+a-naphthylamine Browmsh-red... Recld1sh-V1o1et... Red d1sh-v1olet.. Brown. 7 m-Aminobenzolcacld+m-toluidine llow Scarlet Bluislg-red Y 8 Anthrenilicacid-l-e-anlsidine Orange Blu1sh-red Redd sh-blue 9 m-Aminobenzolcacid+a-naphthylamine Reddishrange-- Reddish-vmlet Redd1sh-blue l0 p-Amlnobenzoicacld+aminohydroquinone-d ethyl-ether. Orange" ...--lRedd sh-vio1et Blu 11 m-Amlnobenzolcacldwnitro-aanlsidine Greems 110w.v Reddish-orange. Red 12 m-Amlnobenzoleacid-H.2-aminonaphtholether Red ".1 Greemsh-blue... Bluish-green.

The dy'estufis are used preferably in the form of their sodium salts and are applied to the acetyl silk from the usual water dye bath without any addition, or if desired with the addition of a weak acid or of a salt or both.

What we claim is 1. The process of dyeing acetyl cellulose which consists in applying amino-azo dyestuffs, solubilized by the presence of car b0 groups and containing no sulphonic aci groups, to the material from the usual water dye bath.

2. The process of dyeing acetyl cellulose which consists in applying amino-azo dyestuifs containing a diazotizable amino group, said dyestuflf being solubilized by the presence of carboxy groups and containin no sulphonic acid groups, to the material rom the usual water dye bath.

In testimony whereof, we have hereunto afiixed our signatures.

J. BADDILEY. ms. HILL. EDWARD BER ANDERSON. 

